Staging: hv: add the Hyper-V virtual bus

This is the virtual bus that all of the Linux Hyper-V drivers use.

Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 156 insertions, 0 deletions

diff --git a/drivers/staging/hv/ChannelMgmt.h b/drivers/staging/hv/ChannelMgmt.h
new file mode 100644
index 000000000000..d5ba5d135949
--- /dev/null
+++ b/drivers/staging/hv/ChannelMgmt.h
@@ -0,0 +1,156 @@
+/*
+ *
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ *
+ */
+
+
+#ifndef _CHANNEL_MGMT_H_
+#define _CHANNEL_MGMT_H_
+
+#include "osd.h"
+#include "List.h"
+#include "RingBuffer.h"
+
+#include "VmbusChannelInterface.h"
+#include "ChannelMessages.h"
+
+
+
+typedef void (*PFN_CHANNEL_CALLBACK)(PVOID context);
+
+typedef enum {
+	CHANNEL_OFFER_STATE,
+	CHANNEL_OPENING_STATE,
+	CHANNEL_OPEN_STATE,
+} VMBUS_CHANNEL_STATE;
+
+typedef struct _VMBUS_CHANNEL {
+	LIST_ENTRY					ListEntry;
+
+	DEVICE_OBJECT*				DeviceObject;
+
+	HANDLE						PollTimer; // SA-111 workaround
+
+	VMBUS_CHANNEL_STATE			State;
+
+	VMBUS_CHANNEL_OFFER_CHANNEL OfferMsg;
+	// These are based on the OfferMsg.MonitorId. Save it here for easy access.
+	UINT8						MonitorGroup;
+	UINT8						MonitorBit;
+
+	UINT32						RingBufferGpadlHandle;
+
+	// Allocated memory for ring buffer
+	VOID*						RingBufferPages;
+	UINT32						RingBufferPageCount;
+	RING_BUFFER_INFO			Outbound;	// send to parent
+	RING_BUFFER_INFO			Inbound;	// receive from parent
+	HANDLE						InboundLock;
+	HANDLE						ControlWQ;
+
+	// Channel callback are invoked in this workqueue context
+	//HANDLE						dataWorkQueue;
+
+	PFN_CHANNEL_CALLBACK		OnChannelCallback;
+	PVOID						ChannelCallbackContext;
+
+} VMBUS_CHANNEL;
+
+
+typedef struct _VMBUS_CHANNEL_DEBUG_INFO {
+	UINT32						RelId;
+	VMBUS_CHANNEL_STATE			State;
+	GUID						InterfaceType;
+    GUID						InterfaceInstance;
+	UINT32						MonitorId;
+	UINT32						ServerMonitorPending;
+	UINT32						ServerMonitorLatency;
+	UINT32						ServerMonitorConnectionId;
+	UINT32						ClientMonitorPending;
+	UINT32						ClientMonitorLatency;
+	UINT32						ClientMonitorConnectionId;
+
+	RING_BUFFER_DEBUG_INFO		Inbound;
+	RING_BUFFER_DEBUG_INFO		Outbound;
+} VMBUS_CHANNEL_DEBUG_INFO;
+
+
+typedef union {
+	VMBUS_CHANNEL_VERSION_SUPPORTED		VersionSupported;
+	VMBUS_CHANNEL_OPEN_RESULT			OpenResult;
+	VMBUS_CHANNEL_GPADL_TORNDOWN		GpadlTorndown;
+	VMBUS_CHANNEL_GPADL_CREATED			GpadlCreated;
+	VMBUS_CHANNEL_VERSION_RESPONSE		VersionResponse;
+} VMBUS_CHANNEL_MESSAGE_RESPONSE;
+
+
+// Represents each channel msg on the vmbus connection
+// This is a variable-size data structure depending on
+// the msg type itself
+typedef struct _VMBUS_CHANNEL_MSGINFO {
+	// Bookkeeping stuff
+	LIST_ENTRY		MsgListEntry;
+
+	// So far, this is only used to handle gpadl body message
+	LIST_ENTRY		SubMsgList;
+
+	// Synchronize the request/response if needed
+	HANDLE			WaitEvent;
+
+	VMBUS_CHANNEL_MESSAGE_RESPONSE Response;
+
+	UINT32			MessageSize;
+	// The channel message that goes out on the "wire".
+	// It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
+	unsigned char	Msg[0];
+} VMBUS_CHANNEL_MSGINFO;
+
+
+//
+// Routines
+//
+
+INTERNAL VMBUS_CHANNEL*
+AllocVmbusChannel(
+	void
+	);
+
+INTERNAL void
+FreeVmbusChannel(
+	VMBUS_CHANNEL *Channel
+	);
+
+INTERNAL void
+VmbusOnChannelMessage(
+	void *Context
+	);
+
+INTERNAL int
+VmbusChannelRequestOffers(
+	void
+	);
+
+INTERNAL void
+VmbusChannelReleaseUnattachedChannels(
+	void
+	);
+
+#endif //_CHANNEL_MGMT_H_